NDLI: Effect of manganese doping on conduction in olivine LiFePO$

Content Provider	Springer Nature Link
Author	Gupta, Reema Saha, Shibu Tomar, Monika Sachdev, V. K. Gupta, Vinay
Copyright Year	2016
Abstract	Lithium ion batteries play a crucial role in terms of good rechargeability, long cycles and higher shelf life. For the fabrication of such a Li ion battery, properties of cathode material can be engineered keeping anode and electrolyte fixed. In the present work, lithium iron phosphate (LiFePO$_{4}$) has been utilized as cathode material and the properties of LiFePO$_{4}$ have been tuned by doping manganese (Mn). LiFePO$_{4}$ and different concentrations of Mn doped LiFePO$_{4}$ were prepared by solid state route. X-Ray diffraction and Raman studies were performed to confirm the formation of LiFePO$_{4}$ and Mn doped LiFePO$_{4}$ in olivine structure. Cyclic voltammetry studies revealed maximum peak oxidation current (2.96 mA) and largest surface coverage (0.066 nanoMoles/cm$^{2}$) for the LiFePO$_{4}$ doped with 15% Mn (LiMn$_{0.15}$Fe$_{0.85}$PO$_{4}$). AC-conductivity study was carried out for different frequencies at room temperature. The conductivity parameters estimated using Almond and West formalism support the cyclic voltammetry results. Ion-hopping rate (ω $_{ p }$) and charge carrier concentration (K) maximize for 15% Mn doping (ω $_{ p }$: 582974.48719 Hz; K: 2.62447 × 10$^{−6}$) and drop on either increasing (ω $_{ p }$: 167134.73521 Hz; K: 1.25647 × 10$^{−7}$) or decreasing (ω $_{ p }$: 130726.49084 Hz; K: 2.52435 × 10$^{−6}$) the Mn doping. The increase till 15% Mn doping has been attributed to the increase in unit cell volume with Mn doping while the sudden decrease at 20% Mn doping is due to dominance of back-hopping mechanism. The results clearly indicate that 15% Mn doped LiFePO$_{4}$ is the most appropriate for the realization of a cathode for Li-ion battery.
Starting Page	5192
Ending Page	5199
Page Count	8
File Format	PDF
ISSN	09574522
Journal	Journal of Materials Science: Materials in Electronics
Volume Number	28
Issue Number	7
e-ISSN	1573482X
Language	English
Publisher	Springer US
Publisher Date	2016-12-19
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optical and Electronic Materials Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Biomaterials Biophysics Condensed Matter Physics Electronic, Optical and Magnetic Materials Bioengineering Electrical and Electronic Engineering Biomedical Engineering

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